Gigabyte ga-ep45-ud3lr recognizes only 3 5gb ram

I have put 6GB of ram into my motherboard. All sticks are from Kingmax (800mhz).
slot1 - 2GB
slot2 - 1GB
slot3 - 2GB
slot4 - 1GB
OS (win7) recognizes only 3.5GB.
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More about gigabyte ep45 ud3lr recognizes
  1. Do you have a 64-bit or 32-bit Windows?

    You need a 64-bit Operating system to utilize more than 3.xGB RAM.

    FULL specs might help.
  2. Yes, it sounds like you have a 32-Bit OS installed...
    Try booting from a 64-Bit live Linux disk, you should be able to see all 6GB then.
  3. If u are not sure what OS type do u have,

    go to Control panel>>>System and than u'll know : )

    And yes, x32bit system will not use more than ~ 3GB.
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